What device measures an earthquake's magnitude by seismic wave amplitude?

Seismograph

Which three sisters determined human destinies? What hero slain the Minotaur in the labyrinth of Crete? What was the name of Captain Nemo's submarine in "20,000 Leagues Under the Sea"? What country invented the sport of rugby? Who is the mythological figure at the center of "Rare Exports: A Christmas Tale"?